Set lastRss in CacheOomRanker.

This mirrors the change for a comment in cherrypicked CL ag/15771575.

Test: atest CacheOomRankerTest
Bug: 196031723
Change-Id: Id2658a356907a0ae1b8606d41e2b2adf3bc6b622

services/core/java/com/android/server/am/CacheOomRanker.java

@@ -364,6 +364,7 @@ public class CacheOomRanker {
                 // First element is total RSS:
                 // frameworks/base/core/jni/android_util_Process.cpp:1192
                 scoredProcessRecord.proc.mState.setCacheOomRankerRss(rss[0], nowMs);
+                scoredProcessRecord.proc.mProfile.setLastRss(rss[0]);
             }
         }